Newton's First Law of motion

Which of the following best describes inertia?

• A resistance to a change in motion

• A force that speeds up motion

• A measure of energy

• A property only of moving objects

Which situation demonstrates Newton’s First Law?

• A ball speeding up as it goes downhill

• A car moving at a constant speed on a straight road

• A person pushing a wall and it pushes back

• A rocket launching into space

If no net force is acting on a moving object, it will:

• Come to a stop

• Speed up

• Change direction

• Keep moving at constant speed

A book on a table stays at rest because:

• It has too little mass

• There is no friction

• No unbalanced force is acting on it

• It is weightless

Why do passengers move forward when a bus suddenly stops?

• The bus pulls them forward

• Gravity pushes them

• The brakes push them forward

• Inertia keeps them moving

Which object has the greatest inertia?

• A pencil

• A bowling ball

• A balloon

• A notebook

When wearing an "inertia hat" on your head and you strike it to apply a force, the hat begins to move but eventually slows down. What causes the inertia hat to slow down after being set in motion?

• The force of gravity pulls it down

• The inertia of the head increases

• The friction between the hanger and your head resists the motion

• The hat loses mass over time

An object in motion stays in motion unless: acted upon by an ________ force.

Because of inertia, an object at rest stays at ____ unless acted upon by an external force.

The tendency of an object to resist changes in it's state of motion or at rest is called _______.